"What wasn’t recognized was the importance of a different species of risk — liquidity risk,” Stephen Figlewski, a professor of finance at the Leonard N. Stern School of Business at New York University, told The Times. “When trust in counterparties is lost, and markets freeze up so there are no prices,” he said, it “really showed how different the real world was from our models.”

In the future, experts say, models need to be opened up to accommodate more variables and more dimensions of uncertainty.

The drive to measure, model and perhaps even predict waves of group behavior is an emerging field of research that can be applied in fields well beyond finance."